I am designing a building with base isolation and selecting a lead rubber isolator to match the axial loads. one of the criteria is nominal long term axial loads what loads and its factors are included in it?
To the best of my knowledge, the stiffness characteristics of rubber bearings are influenced by the axial load they carried. Previous research has demonstrated that the bearing lateral stiffness decreases with increasing axial load and the axial stiffness decreases with increasing lateral deformation. However, the axial load effect is not usually accounted for in dynamic analysis. In other words, you may use constant axial and lateral stiffnesses of the rubber bearings. Please review the work of Keri et al. “EXPERIMENTAL OBSERVATION OF AXIAL LOAD EFFECTS IN ISOLATION BEARINGS”, 13th World Conference on Earthquake Engineering, Vancouver, B.C., Canada, 2004.
I think for answering the question more details are required. You can use the guideline given in the following link, you will find the answer of your question according to the details that might be needed:
https://www.academia.edu/4948840/BASE_ISOLATION_OF_STRUCTURES_DESIGN_GUIDELINES_DESIGN_GUIDELINES_DESIGN_GUIDELINES_DESIGN_GUIDELINES
you may select the service loads (dead plus live).
however during a seismic event the service live load is usually assumed 30% of the total service live load. This of course depends on the type of the building; for example if it is a storage or ware house the sustained live load could be 50% or higher. For a residential building with offices 30% is adequate I think.
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